Casinos are businesses. They make money by taking people’s money and giving them something in return, usually a chance to win money.
Casinos can control how much money players can spend, but they can’t control how people play the games.
Players can control how they play blackjack by following the basic rules of the game. For example, players should always keep track of their cards and never put more than two cards into a single hand.
If a player follows these basic rules, they should have little trouble playing the game without relying on the casino.